Fireworks explode around Burj Dubai, the world's tallest tower, during the opening ceremony in Dubai January 4, 2010. Dubai opened the world's tallest structure on Monday, and a statement said it was 828 metres (2,717 ft) high. Dubai's ruler Sheikh Mohammed bin Rashid al-Maktoum renamed the tower Burj Khalifa after the president of the United Arab Emirates and the ruler of the neighboring emirate of Abu Dhabi.

Fireworks explode around Burj Dubai, the world's tallest tower, during the opening ceremony in Dubai January 4, 2010. Dubai opened the world's tallest structure on Monday, and a statement said it was 828 metres (2,717 ft) high. Dubai's ruler Sheikh Mohammed bin Rashid al-Maktoum renamed the tower Burj Khalifa after the president of the United Arab Emirates and the ruler of the neighboring emirate of Abu Dhabi. (Reuters/Mosab Omar)